We also test our proposed method using SIFT detectors and root SIFT [1]} descriptors, since most previous published work use SIFT. For fair comparison, we implement VLAD with root SIFT descriptors, which have better performance compared with 0.526 on Holidays dataset reported in [2]}. Results as shown in Table REF  demonstrate the superior performance of proposed approach over SIFT descriptors as well. As noted, comparing Tabel REF  and Table REF , we observe in general that using SURF descriptors outperforms SIFT based descriptors.
<FIGURE><TABLE><TABLE>